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简介了某初轧厂13．5t钢锭扎成230mm方坯的原有压下规程，提出了进行压下规程优化设计的指导思想及其原则，并制定了新的优化压下规程。
This paper introduces the original rolling schedule of a 13.5 t steel ingot rolled into a 230 mm billet in a preliminary rolling mill, puts forward the guiding principle and its principles for optimal design of the rolling schedule, and formulates a new optimized rolling schedule.